PET图像定量计算中的误差分析

来源 :中国医学影像学杂志 | 被引量 : 0次 | 上传用户:zjxydn
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目的:分析PET影像中的误差成分,以期为分析PET定量计算精度提供思路.材料与方法:PET,质控模型,18 FFDG,在5个剂量用2D方式采集数据.计算18 F-FDG均匀分布区域像素计数均值和标准差,曲线拟合.结果:综合误差平方随信号变化呈二次曲线型.误差成分可分为三部分:(1)与随机符合相关的成分:正比于信号强度;(2)与放射性统计涨落相关的成分:正比于信号强度平方根;(3)其它成分:与信号强度无关.结论:和γ照相机和SPECT图像中的信噪比随信号源强度一直增加不同,PET图像中特有的随机符合误差使信
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